engels



. 2 Sheets-Sheetl. ENGELS & J. WIELANDA HOT AIR FURNACE.

H.A.&G.H

,490. Patented Apr. 2, 1867.

2 Sheets-Sheet 2.

H. A. & O. H. ENGELS & J. "WIELAND.

' HOT AIR FURNACE.

No. 63,490. Patented Apr. 2, 1 867.

Quint germ 3 5mm @ffitt H. A. ENGELS, CHARLES H. ENGELSAND JOHN WIELAND, OF SAN FRANCISCO, GALIFORNIA.

Letters Patent No. 63,490, dated April 2, 1867.

HOT-AIR. FURNACE.

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Be it known, to whom itm'ay-concern, that we, H. A. Eueans, CHARLES H. Exams, and JonN WIELAND, of San Francisco, county of San Francisco, State of California, have invented a new and improved Hot-Air Furpaoef and we do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, and of which Figure I represents a view of the interior arrangement of the furnace as opened by a vertical section in the line of 1 1, parallel with the front of the furnace, and also opened by a vertical section in the line of 2 2, parallel with the sides of the furnace.

Figure II'is the front elevation of the furnace, with doors to fire-place and ash-box below, and square caps ff to the flue openings for taking out the soot. Through the pipe 0 the smoke escapes, and through the pipe A enters, oris forced to enter by a blower, all pure cold air to be heated and passed. out of pipe for drying purposes.

Figure III represents a vertical section of the furnace parallel with its long sides, showing the returning course of the fire backward and forward alternately around the sets of pipes and square tubes, as indicated by dotted lines and curved arrows; shows the fire-place and ash-box, the encasing platesof the furnace, with the division plates to form those chambersbd'gz'k Zm, which turn the air-current from left to right'and from right to left, etc., through those sets of pipes and square tubes, till the hot air is brought to the place desired by means of pipe l3. Figure III also shows the working space between the oven and brick wall It in the rear, and

also the openings ff for cleaning the flues.

Figure IV shows a horizontal section of the furnace along the line 3 3, with the surrounding still-air space and brick wall it.

In Figures III, IV, also V, VI,'is shown the system of pipes and single pipes witli their flanges, and also their grooved shoulders to stay the side plates at the joints of the sections ofthe furnace, by means of which flanges and shoulders, cast on the pipes, each set of pipes is bolted and cemented together, and at the same time staying the side plates, the sections, and the whole structure of the interior furnace.

The nature of our invention consists in the construction of an apparatus which will answer manifold purposes of application in a thorough, rational, economical, and simple manner. The arrangement we have introduced in our invention of heating a confined cu'rren't (a natural current or accelerated by a blower) of pure air in a system of pipes connected with air-chambers and exposed on two sides to the fire in a returning flue to any degree of'heat, and conductable to any place or apparatus where needed for drying purposes oi otherwise, will speak for itself, and will show its striking usefulness, not alone in connection with our.'other invention of a malt-drying apparatus, out for a multitude of like purposes-drying .vm-micelli, raisins, fruit of all kinds, starch, sugar, etc., and also for warming rooms and buildings generally.

.Thc inventors-beg to point out the peculiar alternating passage of the current of air to be heatedin durable iron pipes, or sets of them, one set above the other, horizontally arranged, apd at the same time building up a returning, hermetically separated iiuc for the fire so as to expose the lower and upper sides of them in succession to the under and above them circulating, gradually rising, and absorbed heat of the fire, and also a combination of horizontally-laid sets of pipes in the lower part of the furnace, and of so laid square box-like tubes for the air in the upper part of the furnace, or rever sed, or, as the case may be, either one of them, for generating a heated current of air in preference to the use of plates alone, or vertical tube arrangements in building up the known air-heating furnaces. As, one of the manifold merits the inventors believe their apparatus to possess may be mentioned the perfect freedom of thehot-air current from all noxious gases produced by the fire, and also the general clcarness and healthiness of the air-current. In continuing to direct proper attention to the matter, the inventors may further add that in their sets of pipes, etc., which, as to size and number, will be particularly adapted to any required case, the greatest surface of the current of air to be heated is exposed to the fire, which therefore expends almost the last degree of heat before leaving the last set of air pipes and chambers and before passing out of the furnace. Finally, thc inventors beg to recommend, as seeming to them worth the judges consideration, the free access to the furnace for. repairing or exchapging single pipes or sets of them, etc, by dividing horizontally the sides or casings of the'fiu'nacc in sections, which are joined along the centres of the pipes and square tubes so that each set A b b, with half its thickness in the lower section of the furnace, and with the other half staying the next section above, and that by this arrangement each section insueoession can be partly or wholly lifted up, overhauled, and reset in cement; also the ease of access to the fines or fire-channels, for cleaning purposes; also that there is left on four sides of this cast-iron furnace, and. between it and the surrounding brick walls, a sufiioient space to lift up those sections for repairing, ete and at the same time a space constantly filled with a non-conducting suhstnnoe, viz, quiet air. It is yet to be remembered that for warming rooms or buildings, etc., when needed, a quantity of steam can he infused into the hot-nit current in the uizinner of the invention patented February 12, 1850, No 7,082, tn H. A. Escnns then of Cincinnati, Ohio, said H. A. ENGELS being a eopnrtner in the invention as described within.

I To enable those skilled in the urti-to understand nnduse-our invention, as described above, we will procoed in showing its construction and operation.

The cold air enters or is forced to enter through pipe A into chamber 6, crosses for the first time through set of pipes a c to the chamber on the right cl, thence upward and to the left, recrossing; the fire through set of pipes e a, into chamber g, thence upward and through set of pipes pp to the right into chamber 2, thence upward and through pipes 11 q, to the left into chamber k, thence through square tube 1 1' into chamber Z on the right, thence upward and through square tube as to the left into chamber 091, and through pipe B to the drying place, etc. 7

The hot-air furmice represented in the annexed plans will show the size of what the inventors would call their hot-air furnaoe,-No. 10," about four (4) feet wide, ten (10) feet long, and eleven 11) feet high, external measurements, which would afibrd u radiating surf-nee of about fifty thousand square inches, threefourt'hs of which is, by the peculiar construction of the fiiinnc(.-, horizontnllylnid out.

What we claim as being our.invent-ion, and desire to secure by Letters Patent,

The arrangement of the sot ol" pipes c ip l -bolted and cemented together, and, at the some time, staying the side plates, the sections, and the whole structure of the furnace by the means of the grooved shoulders and flanges of said pipes, as shown in Figs. V, VI, in combination with the square tubes or drying chambers r s, sub stantinlly in the manner, for the purpose, and upon the principle as herein set forth.

San Francisco, November 16, A. D. 1866.

r H. A. ENGELS,

CHARLES H. ENG-EDS,

Witnesses: v JOHN WIELAND.

H. BERHIRAMIBR, Anonrn G. Wunnh. 

